Self-Structuration of Three-Wave Dissipative Solitons in CW-Pumped Optical Cavities
Generation of ultra-short optical pulses in cw-pumped ring cavities are mostly associated to mode locking in active media, as doped fibers or solid-state (e.g. Ti-Sa) lasers. The cavity contains not only a gain element (atoms or ions) but also a nonlinear element of the host medium, such as self-phase modulation (SPM) or intensity dependent absorption. Spontaneous generation of a pulse train in cw-pumped optical fiber cavities without gain elements can been also obtained through modulation instability caused by the combined action of SPM and group-velocity dispersion (GVD) on the CW optical beam . Our aim here is to present another mechanism for pulse generation in a ring cavity due to the three-wave counterstreaming interaction. In this case, nanosecond pulses are spontaneously generated in a cw-pump Brillouin-fiber-ring laser . We show that the same three-wave counterstreaming interaction responsible of symbiotic solitary wave morphogenesis in the Brillouin-fiber-ring laser  may act for picosecond pulse generation in a quadratic optical cavity (optical parametric oscillator) . The resonant condition is automatically satisfied in stimulated Brillouin backscattering (SBS) when the fiber-ring laser contains a large number of longitudinal modes beneath the gain curve, since the cw-pump selects among them the resonant acoustic wave (of wavelength near the half of the pump- or Stokes- wavelength). However, in order to achieve quasi-phase matching between the three optical waves in the x (2) medium a grating of sub-μm period is required. Recent experiments of backward second-harmonic generation in periodically-poled LiNbO3 [5, 6] avoids this technical difficulty by using higher-order gratings.
KeywordsSolitary Wave Optical Parametric Oscillator Pump Intensity Idle Wave Solitary Wave Structure
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- Agrawal G.P., Post B., Nonlinear Fiber Optics 2nd ed. New York: Academic ( 1995.Google Scholar
- Montes C.) MamhoudA., and Picholle E., Phys. Rev. A 49 (1994) 1344.Google Scholar
- Gu X, Korotkov R.Y., Ding Y.J., Kang J.U., and Khurgin J.B., J. Opt. Soc. Am. B 15 (1998) 1561.Google Scholar
- Armstrong J.A., Jha S.S., and Shiren N.S., IEEE J. Quant. Elect. QE-6 (1970) 123.Google Scholar
- Montes C., Picozzi A., and Bahloul D., Phys. Rev. E 55 (1997) 1092.Google Scholar
- Yang S.T., Eckaerdt R.C., and Byer R.L., J. Opt. Soc. Am. B 10 (1993) 1684.Google Scholar
- Trillo S. and Haelterman M., Opt. Lett. 21 (1996) 1114.Google Scholar